问题
填空题
sin(arccos
|
答案
sin(arccos
+arccos1 2
)=sin(arccos1 3
)cos(arccos1 2
)+cos(arccos1 3
)sin(arccos1 2
)=1 3
•1- 1 4
+1 3
•1 2
=1- 1 9 2
+2 3 6
故答案为;2
+2 3 6
sin(arccos
|
sin(arccos
+arccos1 2
)=sin(arccos1 3
)cos(arccos1 2
)+cos(arccos1 3
)sin(arccos1 2
)=1 3
•1- 1 4
+1 3
•1 2
=1- 1 9 2
+2 3 6
故答案为;2
+2 3 6